Physics Friction formula help!?

Physics Friction formula help!?



A box of mass M is being accelerated up a vertical wall by a constant force F applied at an angle ? with the vertical, as shown. If the coefficient of kinetic friction between the box and wall is µk , what is the magnitude of the acceleration of the box?

1. a =
F
M
(cos ? + µk sin ?) ? g

2. a = g ?
F sin ?
M

3. a =
F
M
? g

4. a = µk g

5. a =
F
M
(sin ? ? µk cos ?) + g

6. a =
F
M
from Newton’s Second Law

7. a =
F
M
(cos ? ? µk sin ?) ? g

8. a =
F
M
(sin ? ? µk cos ?) ? g

9. a =
F sin ?
M

10. a = 0 since kinetic friction makes the box
slide at constant velocity





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